Tagan TG480-u01

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  • bokkie
    Member
    • May 2013
    • 13
    • holland

    #1

    Tagan TG480-u01

    Tagan TG480-u01 PSU worked fine for years in my wife's pc.
    Her videocard had problems so i baked it, worked great for months.
    Problems came back, backed it again and fine for months again ...
    now i baked it for the third time ....
    PC wouldn't start.
    measured the videocard's resistance between ground and 12v (pci-e 6pin)
    low ohm (?150? can't remember)
    so last bake wasn't that good of an idea

    anyhow...

    psu 5vsb is present (purple wire), 5v switch is present (green wire) and pulls low on power-on
    but nothing happens, no fans nothing
    you can hear a very faint ticking

    pulled the psu apart, nothing to see, even all the caps look pristine (the ones i measured esr are fine)

    desoldered both heatsinks + diode's/transistors
    only defect i could find till now is one of the 2 2sc3320 is blown (base-collector gives 150ohm both way's)

    anything else i should check or should replace the 2sc3320 suffice ?
  • bokkie
    Member
    • May 2013
    • 13
    • holland

    #2
    Re: Tagan TG480-u01

    found some bu508a, higher voltage lower amperage thou
    put them in just for testing and running fine

    anyone have an idea thou how to mod the fancontrolboard for higher speed ?

    Comment

    • domas
      News Hater
      • May 2013
      • 323
      • Denmark

      #3
      Re: Tagan TG480-u01

      can you take a picture of your board? both sides please

      i have a spare one i am looking at now, and I see a resistor connected to a thermistor, try changing that one to one with lower value, it is marked as FR7 on my board.

      My thermistor is reading 2.7Kohms in +20C ambient temp.. it got as low as 0.6-0.7Kohm as I heated it with a lighter if your does the same, you will know how resistance is related to temp and change components accordingly

      Comment

      • bokkie
        Member
        • May 2013
        • 13
        • holland

        #4
        Re: Tagan TG480-u01

        made a sort of diagram of the fan controller

        left you can see the 3 fan headers and on top is the input going through 470 and 560 and so on
        Attached Files
        Last edited by bokkie; 05-28-2013, 12:47 PM.

        Comment

        • bokkie
          Member
          • May 2013
          • 13
          • holland

          #5
          Re: Tagan TG480-u01

          weird, 5v and 3.3 are perfectly fine
          on the 12v line, i only get 11v at no load, with a 1A fan it even drops to about 10.9v
          this psu i so da*n crowded, hard to follow the rail.
          does anyone have diagrams/schematics for this "topower" design?

          Comment

          • bokkie
            Member
            • May 2013
            • 13
            • holland

            #6
            Re: Tagan TG480-u01

            under load 12v is fine (12.14)
            so working again

            only the fan-mod resides, should be the 3.3k ohm i guess ?!

            Comment

            • Behemot
              Badcaps Legend
              • Dec 2009
              • 4845
              • CZ

              #7
              Re: Tagan TG480-u01

              You may try pot to find the right value
              Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

              Exclusive caps, meters and more!
              Hardware Insights - power supply reviews and more!

              Comment

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